Improvement in boor-springs



ALEXANDER T. BALLANTINE, OE-TITUSvrLLE, PENNSYLVANIA,

N. R. BATES, AND L. D. PHELPS,

SELF, W. W. KINGSLAND,

ASSIGN OR TO HIM- 0F SAME PLACE.

Leners Parent No. 102,197, laterz A ,im 19, 1870.

IMPROVEMENT IN DOOR-SPRINGS.

The Schedule referred.- to in these Letters Patent and making part ofthe same To all 'whom it'ma-y concern:

B e it known that I, ALEXANDER T. BALLANTINE, of Titusville, in the.county of Crawford and State of Pennsylvania, have invented certain newand useful Improvements in Door-Springs and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings which make part of thisspecification, and in which- Figure 1 represents an elevation of aportion of a door and its frame, showing a spring embracing myimprovement.

Figure 2 represents a plan or top view of the same.

Figure 3 represents a similar view, showing the door open.

My invention relates to springs applicable to doors, gates, &c., forclosing them, and consists in' the construction and arrangement of acurved arm mounted upon a swiveling-stem secured to the inner side ofthe door, in combination with a iiexible strapattached to said curvedarm and to the door in such mannerl that when it is closed the strapwill hug the said curved arm closely; and, when being opened, it willspread out from Said arm, drawing the latter backward over the top ofthe door in a direction opposite to that in which it is opened, so thatthe curved arm, whether in opening or closing the door, always has adirect pull on its connecting-strap, making the spring very simple andcompact.

In the accompanying drawings- Al represents the door, and.

To the inner side of" the door, at the top thereof, is secured avertical tubular arm support, C, within which is arranged the stern Dofthe curved operating arm E, which latter is permanently fixed to thesaid stem, and projects therefrom horizontally, so as to describe asemi-ellipse or semicircle.

To the outer end a of this 'arm E a flexible strap, F, is attached, theother end, b, of the latter being secured to the door-frame B, nearxthehub of the arm, so that, when the door A is closed, the saidconnectingstrap will lie snugly against the convex side of the springarm E. This strap F is made of hoop-steel, and is, therefore, perfectlyflexible, and, in its attachment to the arm E and door F, assumes a bowform, so that, in opening and closing the door, it exerts a certaindegree' of force.

The stem D of the curved arnr is vsurrounded by a spiral spring, G, oneend of which 'is attached to the lower' end of' said stem, and theother'to the ripper end ofthe inclosing tube C, so as to resist theturning of' the arm toward the frame as the door is being opened.

The connecting-strap F, attachedv `at the point a of the arm E, and tothe door-frame B near the hub of said arm, draws the latter backward andinward over` the top of the door from opposite the inner side of thelatter' to opposite itsoter side when opened, which has the effect ofstraightenin r its connecting-'strap F against the action oftheclosing-'spring G, and, as the door closes, the said arm E is broughtagaintothe inner side ofthe door, bringing with it its connectingstrap Faround and against its convex side.

The spring arm Eis connected so that it may be readily attached to andremoved from its supportingcase, and the counccting-strap may beinelastic,A ifdesir'ed. 5

Having described my invention,

The strap F, connected to thcdoor-frame and to the curved spring arm E,in such manner that the former will hug the convex side of thelatter-when the door is closed, and operate, by such connection, to pullsaid curved arm around over the top ofthe door as the latter' is opened,as and for the purpose herein described.

ALEXANDER l. BALLANTINE. itnessess J. J. HOLDEN, O. A. SELDEN.

